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In this video we exhaustively test the capability of the stock intake system on the new Subaru VB WRX with the fa24 turbo engine. Back to back to back dyno testing of the factory airbox, AEM drop-in filter, modded airbox (both stock filter and AEM) and the Extreme Turbo Systems ETS cold air intake system with airbox. At the end we test an aftermarket intake duct from APR Carbon Fiber as well.